animated Laf changing added to flatlaf-extras, used in Demo

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/ControlBar.java

@@ -27,6 +27,7 @@ import javax.swing.UIManager.LookAndFeelInfo;
 import javax.swing.plaf.metal.MetalLookAndFeel;
 import javax.swing.plaf.nimbus.NimbusLookAndFeel;
 import com.formdev.flatlaf.*;
+import com.formdev.flatlaf.extras.FlatAnimatedLafChange;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 import net.miginfocom.swing.*;
@@ -193,6 +194,8 @@ class ControlBar
 
 		EventQueue.invokeLater( () -> {
 			try {
+				FlatAnimatedLafChange.showSnapshot();
+
 				// change look and feel
 				UIManager.setLookAndFeel( lafClassName );
 
@@ -202,6 +205,7 @@ class ControlBar
 
 				// update all components
 				FlatLaf.updateUI();
+				FlatAnimatedLafChange.hideSnapshotWithAnimation();
 
 				// increase size of frame if necessary
 				int width = frame.getWidth();

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.java

@@ -27,6 +27,7 @@ import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.demo.extras.*;
 import com.formdev.flatlaf.demo.intellijthemes.*;
+import com.formdev.flatlaf.extras.FlatAnimatedLafChange;
 import com.formdev.flatlaf.extras.FlatSVGIcon;
 import com.formdev.flatlaf.extras.SVGUtils;
 import com.formdev.flatlaf.ui.JBRCustomDecorations;
@@ -105,14 +106,21 @@ class DemoFrame
 		repaint();
 	}
 
+	private void animatedLafChangeChanged() {
+		System.setProperty( "flatlaf.animatedLafChange", String.valueOf( animatedLafChangeMenuItem.isSelected() ) );
+	}
+
 	private void fontFamilyChanged( ActionEvent e ) {
 		String fontFamily = e.getActionCommand();
 
+		FlatAnimatedLafChange.showSnapshot();
+
 		Font font = UIManager.getFont( "defaultFont" );
 		Font newFont = StyleContext.getDefaultStyleContext().getFont( fontFamily, font.getStyle(), font.getSize() );
 		UIManager.put( "defaultFont", newFont );
 
 		FlatLaf.updateUI();
+		FlatAnimatedLafChange.hideSnapshotWithAnimation();
 	}
 
 	private void fontSizeChanged( ActionEvent e ) {
@@ -248,6 +256,7 @@ class DemoFrame
 		menuBarEmbeddedCheckBoxMenuItem = new JCheckBoxMenuItem();
 		underlineMenuSelectionMenuItem = new JCheckBoxMenuItem();
 		alwaysShowMnemonicsMenuItem = new JCheckBoxMenuItem();
+		animatedLafChangeMenuItem = new JCheckBoxMenuItem();
 		JMenu helpMenu = new JMenu();
 		JMenuItem aboutMenuItem = new JMenuItem();
 		JToolBar toolBar1 = new JToolBar();
@@ -501,6 +510,12 @@ class DemoFrame
 				alwaysShowMnemonicsMenuItem.setText("Always show mnemonics");
 				alwaysShowMnemonicsMenuItem.addActionListener(e -> alwaysShowMnemonics());
 				optionsMenu.add(alwaysShowMnemonicsMenuItem);
+
+				//---- animatedLafChangeMenuItem ----
+				animatedLafChangeMenuItem.setText("Animated Laf Change");
+				animatedLafChangeMenuItem.setSelected(true);
+				animatedLafChangeMenuItem.addActionListener(e -> animatedLafChangeChanged());
+				optionsMenu.add(animatedLafChangeMenuItem);
 			}
 			menuBar1.add(optionsMenu);
 
@@ -620,6 +635,7 @@ class DemoFrame
 	private JCheckBoxMenuItem menuBarEmbeddedCheckBoxMenuItem;
 	private JCheckBoxMenuItem underlineMenuSelectionMenuItem;
 	private JCheckBoxMenuItem alwaysShowMnemonicsMenuItem;
+	private JCheckBoxMenuItem animatedLafChangeMenuItem;
 	private JTabbedPane tabbedPane;
 	private ControlBar controlBar;
 	// JFormDesigner - End of variables declaration  //GEN-END:variables

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.1.0.272" Java: "13.0.2" encoding: "UTF-8"
+JFDML JFormDesigner: "7.0.2.0.298" Java: "14.0.2" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -356,6 +356,15 @@ new FormModel {
 						}
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "alwaysShowMnemonics", false ) )
 					} )
+					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
+						name: "animatedLafChangeMenuItem"
+						"text": "Animated Laf Change"
+						"selected": true
+						auxiliary() {
+							"JavaCodeGenerator.variableLocal": false
+						}
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "animatedLafChangeChanged", false ) )
+					} )
 				} )
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "helpMenu"

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesPanel.java

@@ -49,6 +49,7 @@ import com.formdev.flatlaf.FlatLightLaf;
 import com.formdev.flatlaf.FlatPropertiesLaf;
 import com.formdev.flatlaf.IntelliJTheme;
 import com.formdev.flatlaf.demo.DemoPrefs;
+import com.formdev.flatlaf.extras.FlatAnimatedLafChange;
 import com.formdev.flatlaf.extras.FlatSVGIcon;
 import com.formdev.flatlaf.util.StringUtils;
 import net.miginfocom.swing.*;
@@ -219,6 +220,8 @@ public class IJThemesPanel
 			if( themeInfo.lafClassName.equals( UIManager.getLookAndFeel().getClass().getName() ) )
 				return;
 
+			FlatAnimatedLafChange.showSnapshot();
+
 			try {
 				UIManager.setLookAndFeel( themeInfo.lafClassName );
 			} catch( Exception ex ) {
@@ -226,6 +229,8 @@ public class IJThemesPanel
 				showInformationDialog( "Failed to create '" + themeInfo.lafClassName + "'.", ex );
 			}
 		} else if( themeInfo.themeFile != null ) {
+			FlatAnimatedLafChange.showSnapshot();
+
 			try {
 				if( themeInfo.themeFile.getName().endsWith( ".properties" ) ) {
 				    FlatLaf.install( new FlatPropertiesLaf( themeInfo.name, themeInfo.themeFile ) );
@@ -238,12 +243,15 @@ public class IJThemesPanel
 				showInformationDialog( "Failed to load '" + themeInfo.themeFile + "'.", ex );
 			}
 		} else {
+			FlatAnimatedLafChange.showSnapshot();
+
 			IntelliJTheme.install( getClass().getResourceAsStream( THEMES_PACKAGE + themeInfo.resourceName ) );
 		    DemoPrefs.getState().put( DemoPrefs.KEY_LAF_THEME, DemoPrefs.RESOURCE_PREFIX + themeInfo.resourceName );
 		}
 
 		// update all components
 		FlatLaf.updateUI();
+		FlatAnimatedLafChange.hideSnapshotWithAnimation();
 	}
 
 	private void saveTheme() {